IOSR Journal of Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 05, Issue 08 (August. 2015), ||V1|| PP 08-14
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The Modal Analysis of Vibro Ripper Gear based on CATIA Hu Kaijun1, Yang Guoping1, CaoGuojun2 1.Automotive Engineering College, Shanghai University of Engineering Science, Shanghai 201620, China 2. Shining Shanghai Mechanical Technology Co.Ltd,Shanghai,201804,China Abstract: - Through the parametric design and FEA function of CATIA, we build 3D model and finite element modal of Vibro Ripper gear. Meanwhile, we make modal analysis of gear and get natural frequency and modal shape of it.The analysis shows when the gear rolls at a high speed, gear will create a centrifugal stiffening effect on account of the centrifugal elastic deformation. Besides, the natural frequency increases with gear’s speed and some modal shape changed. Moreover, the radius and thickness of block have a great impact on gear’s modal analysis, and radius impactsfrequency more intricate than thickness. Key words: Vibro ripper gear; block; natural frequency, modal shape
I.
INTRODUCTION
The high efficiency and low noise of Vibro Ripper have attracted a widespread attention in engineering field. But now there are no more references about Vibro Ripper all over the world, it is new machinery[1]. Vibro Ripper creates force by gear with block and breaks stone or beton. The block roll by gear and becomes the main source of force, gear and block are the core of Vibro Ripper. On account of the special design of Vibro Ripper, it always vibrate heavily and some componentsare easy to be destroyed in the work.Fig.1 shows the structure of Vibro Ripper gear, helical gear and eccentric block are made by integration as well as with high strength[2-4].In this paper, we make an emphasis on modal analysis of Vibro Ripper gear, include the impact of gear’s speed, radius and thickness of block to the modal of Vibro Ripper gear.Meanwhile, we get some conclusions and which will provide some guidance to the production of our factory.
Fig.1 Structure of Vibro Ripper gear
II.
Fig.2 3D model
Fig.3 Finite element model
ESTABLISHMENT OF MODEL
2.1 3D model The geometric parameters of Vibro Ripper gear are as follows, teeth Z=56, module mn=7mm,tooth width b=50mm, pressure angle αn=20o, helix angle β=18o,block radius R=288mm, block thickness h=100mm, arbor hole radius r=56mm. In order to get an accurate model and can be modified easily, we use parametric design of CATIA to draw the
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